Ray's current research focuses on electrodes for solid oxide fuel cells (SOFC) and on oxidation catalysis using mixed-oxides. With SOFC, his lab has developed a method to synthesize electrodes with unprecedented control over composition and nanostructure, fabricating high-performance cells that are able to operate on hydrocarbon fuels. In oxidation catalysis, his group has developed methods to measure the thermodynamic, redox properties of mixed oxides and then determine the effect changes in redox properties have on catalytic properties.